JVC 330 Service Manual page 61

IIC O VIDOK
IIC O SWEEPOK
IIC O BEAMDET
BUS I/O Information
Serial I REDBIAS
Serial I GRNBIAS
Serial I BLUBIAS
Serial I RCONT
Serial I GCONT
Serial I BCONT
Serial I BRIGHT
General I/O
This section provides a comprehensive description of the inputs to and outputs
from the VPB. The I/O description are arranged by the source/destination of the
signal and so the assemblies communicated with are used as the primary heading
of each group of signals and then are further subdivided into inputs and outputs. In
each case, the signal's direction is noted, with input referring to an input to the
RTG, and output to an output from the VPB. (e.g.: under Raster Timing Generator
'Input'; VSYNC refers to the signal VSYNC that is an input to the VPB from the
Raster Timing Generator). When test points are provided for the I/O they are
noted.
Table 2-11. Video Processor Board I/O Signals
Input
IICCLK
BONSCRN
RONSCRN
GONSCRN
VONSCRN
VIDTEST
RSENS
GSENS
BSENS
Model 330, 340SC and 370SC Service Manual
Tells SCB that no VABs are reporting problems.
Tells SCB that all sweeps are operating.
Tells SCB that beam current limiting is occurring.
Description
Commanded amplitude of red LCLV bias.
Commanded amplitude of green LCLV bias.
Commanded amplitude of blue LCLV bias.
Commanded red contrast.
Commanded green contrast.
Commanded blue contrast.
Commanded brightness level.
System Controller Board
Description
IIC clock line. Unidirectional clock line for control of
synchronous data transfer over IIC data bus.
Along with RONSCRN, GONSCRN, VONSCRN,
VIDBLANK, and DCRSTR (the later two on from the
RTG board) determines whether there is full brightness,
black, gray-scale, or external video presented in blue at a
given point on the screen.
Similar to BONSCRN.
Similar to BONSCRN.
Determines if internal test patterns will be shown.
Internal gray-scale video input information. Real time data 0V
to 1V.
Sensitivity (Z-axis gain) correction information for red. Real
time data at 0V to 1V.
Similar to RSENS.
Similar to RSENS.
Chapter 2—Functional Description
2-49